Powerset is a search engine that allows users to express their queries as phrases, rather than a few keywords. It uses natural language processing (NLP) technologies to analyze the verb-argument structure of a query and deliver more focused search results, initially just from Wikipedia. Powerset has attracted interest from the NLP community, as its services promise to demonstrate the value of NLP - and of language analysis more generally - in extracting information from the trillion or more words of text on the web. On Tuesday, Microsoft announced it has acquired Powerset, and that Powerset will become part of Microsoft's Search Relevance team. I hope this takeover means that natural language search will become mainstream, scaled up to the entire web, and used far more widely than before [Powerset blog|Microsoft Live Search blog].